Arthur pillsbury dodge



Patented Dec. 20,v |898.

A. P. DODGE.

STEAM BUILER.

Dec.1 1

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UNITED STATES PATENT OFFICE.

ARTHUR PILLSBURY DODGE, OF NEWr YORK, N. Y.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 616,088, dated December20, 1898.

Application tiled December 1, 1897- Serial No. 660,416. (No model.)

To @ZZ whom it may concern.'

Be it known that I, ARTHUR PILLsBURY DODGE, a citizen of the UnitedStates, residing in the city, county, and State of New York, haveinvented certain new and useful Improvements in Steam-Boilers,- of whichthe following is a specification.

My invention relates to steam-boilers, and particularly to a form ofboiler adapted for use on motor-cars for street-car service.

The object of my invention is to provide a boiler of an elongated typeadapted to be placed below the motor-car, as in Letters Patent No.585,624, dated June 29, 1897; and I aim to provide a boiler having aquick and effective circulating system, one which may be made up ofseamless tubes, and one which will provide a large heating-surface andin which the liability of priming or passing water to the cylinders willbe prevented.

In the accompanying drawings, Figure l is a plan View of the boiler.Fig. 2 is a side view, partly in section; and Fig. 3 is a crosssectionalview looking from the right-hand end of Fig. 2, with parts broken away;

The boiler comprises three seamless tubes A B B', of which the onemarked A is the largest and constitutes the upper part of the boiler,the smaller tubes B B' being arranged below and on each side of thelarge tube A, with spaces between. At one end these tubes are connectedby ahead D, common to all three and forming a connection and a rigidsupport for the tubes, and this head may be provided with a cold-airdraft or observation hole at D'. At the rear end of the boiler the tubesare connected and supported by a coinpound head C, which head rigidlysupports the tubes, as does also the head D, both collectively andseparately. The compound head C has passages c c' c2, forming acirculating connection between the three tubes at this end of the boilerto permit the water to circulate freely from the upper tube downward tothe lower parts of the lower smaller tubes through the passages c' c2.From the lower cross-passage c in the compound head O circulating-pipesc3 extend forwardly and incline upward ly to the combustion-chamber,Where they are bent down at an inclination to the mud-drum, and fromthence they extend upwardly at an inclination toward the front toconnect with a manifold X. This manifold is connected with the front endof the large tube of the boiler, at the bottom thereof. This provides acirculation from the rear end of the lower tubes B B', through thecirculating-tubes c3, to the front, up through the manifold, into theupper large tube, and thence to the rear through the large tube, downthrough the compound head, to the lower tubes, and then through thecrosspassage/ c to the circulating-pipes. three tubes are covered by anasbestos or other non-conducting shell, forming a boiler ofsubstantially triangular cross-sectional shape, and this providesheating and flue spaces K' between the various tubes through which theproducts of combustion may pass and circulate about the tubes andcirculatingpipes to heat the same to the highest degree possible from agiven amount of heat in the fire-box. This fire-box opens directlyintothe casing at one end, so that all the products of combustion aredischarged over the bridgewall L', and at the rear these products passThe through the opening K in the compound head into the liue orsmoke-stack l a hand-hole being provided at K2 for cleaning purposes.The inclined connectionA of the circulatingpipes c3 with the mud-drumprovides for the expansion and contraction of the pipes withoutstraining the connection with the muddrum E. Equalizing-pipes G connectthe lower tubes B B' with the upper tube A. The steam is taken from thedome H, arranged centrally of the upper tube, through the pipe H', whichextends down into the space within the jacket of the boiler and from thelower end of which steam-pipes H2 lead off to the cylinders, these pipesH?l being located within the flue or heating space of the boiler to besuperheated by the. passage of the products of combustion.

L2 represents the fire-door ofthe fire-box.

The water may be fed into the boiler atpthe point J Scale, which willcollect in the muddrum as water circulates through it, will be blown outat the end of the drum, where the drum is provided with a blow-off.

The heads of the mud-drum project outside the combustion-chamber, andthey may be IOO readily removed for the purpose of cleaning the drum.

The hot gases from the hre-box pass over the mud-drum and longitudinallyof the pipes c3 in a direction opposite to the circulation of waterthrough the tubes c3, thus securing the highest degree of efficiency inheating the water, as the hottest gases meet the hottest water, whilethe cooler gases meet the cooler water, and thus a thorough interchangeof heat is secured.

Vhile I have described the tubes A B B' as being large and small, withthe large pipe uppermost, Ido not limit myself to this arrangement orrelative sizes of the tubes.

I claiml. In combination, a portable boiler of elongated type forlocomotives comprising a series of large tubes arranged in differentplanes, a casing inclosing the same forming passages for the products ofcombustion within the casing and adjacent to the tubes, andcirclilating-pipes for the water in connection with the tubes at thelower part at one end and with the upper tube at the other end, saidpipes extending longitudinally of the boiler and between the tubesthereof, said boiler having a fire-box to discharge theprod ucts ofcombustion into the casing, substantially as described. l

2. In combination in a portable boiler of elongated type forlocomotives, a series of large tubes extending longitudinally thereofwith spaces between them for the products of combustion, a casinginclosing the tubes and Lie-spaces,water-circulatin g pipes Within thecasing and connecting with the lower tubes at one end and with a highertube at the other end, said pipe being within the fine-spaces and afire-box discharging the products of combustion into the iiue-spaces,asteam-dome arranged centrally of the upper tube of the boiler, the steampipe or pipes within the casing to be acted upon by the products ofcombustion and a connection extending down from the steam-dome to thesteam-pipe, substantially as described.

3. In combination in a boiler of elongated type, the series of largetubes arranged with spaces between them, a jacket inclosing the tubes, ahead supported at one end and having a series of passages thereinconnecting the tubes and circulating-pipes extending longitudinally ofthe boiler and between the tubes, said circulating-pipes being connectedwith one of the passages in the boiler-head, substantially as described.

4:. In combination in a boiler of elongated type, a series of tubescomprising an upperl tube A and two tubes B 3' below the same and oneach side of the center thereof, a jacket inclosing the tubes a head atone end of the boiler having passages connecting the tubes, a series ofpipes connected with one of said passages and extending longitudinallyof the boiler between the tubes and a manifold forming a connectionbetween said circulating-pipes and the upper tube of the boiler,substantially as described.

5. In combination in a boiler of an elongated type, a series of largetubes, a casing inclosing the same, the furnace at one end, themud-cylinder at one end and below the tubes, the circulating-pipesextending between the tubes and having inclined connections with themud-cylinder, said pipes being connected with the upper tube of theboiler at one end and with the lower tube at the other end,substantially as described.

G. In combination, the boiler, comprising the series of large tubes, thejacket forming {ine-spaces between the tubes, the furnace at one end ofthe boiler, a head C at the other end of the boiler having passagestherein con necting the tubes and having a flue-opening and asmoke-stack leading thereform, substantially as described.

7. In combination, a boiler of elongated form made up of a series oftubes, the heads at the ends of the tubes a j aeket surrounding thetubes and forming flue-spaces, the equalizing connections G between thetubes and the circulating-pipes within the jacket and between the tubesconnecting the end of one lower tube with the opposite end of an uppertube.

S. In combination with the boiler comprising the large tubes, the jacketabout them, the fire-box discharging into the space within the jacketand the superheater-pipes extending within the jacket to be acted uponbythe products of combustion,the said j acketlitting the tubes closelyand providing a portable boiler for locomotives and the like,substantially as described.

9. In combination with the tubes A, B, B', the heads connecting thetubes and removable therefrom, the mud-drum having its ends projectingoutside of the walls of the combustionchamber, the removable headsthereon and the blow-oit device,substantially as described.

lOf A portable boiler for locomotives and the like comprising the threelarge tubes, the lower ones being arranged toward each side of thecenter of the upper one, a jacket of sheet metal inclosing the tubes, adome on the upper tube, the steam-pipe in the space between the tubesand within the jacket, a connection leading down from the dome to thesaid steam-pipe, the water-circulating pipes connected to the lowertubes at one end and to the upper tube at the other end, saidcirculating-pipes extending through the fluespace between the tubes afurnace at one end of the boiler and equalizing connections between thetubes, substantially as described.

In testimony whereof I aliix my signature in presence of two witnesses.

ARTHUR PILLSBURY DODGE.

IVitnesses:

HORACE F. HoDGEs, WM. W. THOMAS, J r.

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